Hello from a new list member, interested in multilingual web sites

greetings to all!

I dont presently have a web page, in fact I havent really bothered with
HTML for 4 or 5 years (I've had other fish to fry).

But recently I have been asked to help implement two different sites which
are meant to be bilingual.    Consequently I am reviewing HTML 4.01 to
catch up, and I am looking into resources on ISO 10646.

I would appreciate any suggestions or comments, including references (web
or print).

In terms of planning (before I have the latest HTML in mind), I would like
to know whether it is feasible to mix the writing systems for two languages
in the same pages, or if it is better to develop a double-site, where the
content is merely reproduced separately (i.e., with each page in it's own
language format).

The two projects I am preparing for are:

An English and Japanese site for a new business, 

and

A Korean and English site for a non-profit organization.

Thanks in advance!

(Software suggestions will also be welcome, as well as advice on making the
non-western text more widely readable by the general audience)

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